:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #667085;
  --soft: #f5f7fb;
  --paper: #ffffff;
  --line: rgba(17, 24, 39, 0.1);
  --blue: #246bfe;
  --cyan: #14b8c4;
  --green: #0f766e;
  --red: #e44456;
  --gold: #d6a34a;
  --shadow: 0 24px 70px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Inter", "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  background: #f7f9fc;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.42);
  background: rgba(247, 249, 252, 0.82);
  padding: 14px clamp(20px, 5vw, 72px);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 8px;
  background: linear-gradient(135deg, #153b71, #17a9a6 56%, #e7445d);
  color: white;
  font-size: 17px;
  font-weight: 900;
  line-height: 1.12;
  text-align: center;
  box-shadow: 0 14px 34px rgba(36, 107, 254, 0.22);
}

.brand strong,
.brand em {
  display: block;
}

.brand strong {
  font-size: 18px;
  font-weight: 900;
  white-space: nowrap;
}

.brand em {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
  font-style: normal;
  letter-spacing: 0.04em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.6vw, 32px);
  color: #344054;
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

.site-nav a {
  padding: 8px 0;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.9fr);
  align-items: center;
  gap: 52px;
  min-height: min(760px, calc(100vh - 87px));
  overflow: hidden;
  padding: clamp(34px, 5.6vw, 72px) clamp(20px, 5vw, 72px) clamp(36px, 5.6vw, 68px);
  background:
    linear-gradient(120deg, rgba(36, 107, 254, 0.1), transparent 32%),
    linear-gradient(180deg, #ffffff 0%, #eef4fb 100%);
}

.hero::after {
  content: "";
  position: absolute;
  right: -8vw;
  bottom: -18vw;
  width: 52vw;
  height: 52vw;
  background:
    linear-gradient(135deg, rgba(20, 184, 196, 0.22), rgba(228, 68, 86, 0.18));
  clip-path: polygon(22% 0, 100% 18%, 82% 100%, 0 78%);
}

.hero-copy,
.hero-stage {
  position: relative;
  z-index: 1;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  border: 1px solid rgba(36, 107, 254, 0.18);
  border-radius: 999px;
  background: rgba(36, 107, 254, 0.08);
  color: #1d4ed8;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  padding: 8px 12px;
}

.hero h1,
.section-heading h2,
.showcase h2,
.cta-section h2 {
  margin: 18px 0 0;
  font-weight: 950;
  letter-spacing: 0;
  line-height: 1.08;
}

.hero h1 {
  max-width: 820px;
  font-size: clamp(44px, 6.4vw, 78px);
}

.hero p {
  max-width: 710px;
  margin: 22px 0 0;
  color: #475467;
  font-size: clamp(17px, 1.6vw, 22px);
  font-weight: 600;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  border-radius: 8px;
  font-weight: 900;
  padding: 0 22px;
}

.primary-action {
  background: #111827;
  color: white;
}

.secondary-action {
  border: 1px solid var(--line);
  background: white;
  color: #344054;
}

.hero-stage {
  min-height: 500px;
}

.system-panel {
  border: 1px solid rgba(255, 255, 255, 0.68);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.panel-main {
  position: absolute;
  inset: 52px 0 auto auto;
  width: min(100%, 560px);
  min-height: 330px;
  padding: 28px;
}

.panel-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: #344054;
  font-size: 14px;
  font-weight: 900;
}

.panel-topline strong {
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.12);
  color: var(--green);
  padding: 8px 12px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.metric-grid div {
  min-height: 112px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 18px;
}

.metric-grid b {
  display: block;
  color: #153b71;
  font-size: clamp(30px, 3vw, 46px);
  font-weight: 950;
}

.metric-grid span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.flow-line {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 30px;
}

.flow-line i {
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
}

.panel-side {
  position: absolute;
  left: 0;
  bottom: 42px;
  width: 330px;
  padding: 24px;
}

.panel-side span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

.panel-side strong {
  display: block;
  margin-top: 10px;
  color: #111827;
  font-size: 24px;
  line-height: 1.32;
}

.hero-orbit {
  position: absolute;
  display: grid;
  place-items: center;
  width: 76px;
  height: 76px;
  border-radius: 50%;
  color: white;
  font-weight: 950;
  box-shadow: 0 18px 46px rgba(15, 23, 42, 0.18);
}

.hero-orbit.one {
  top: 22px;
  right: 92px;
  background: var(--blue);
}

.hero-orbit.two {
  left: -42px;
  top: 250px;
  background: var(--red);
}

.hero-orbit.three {
  right: 38px;
  bottom: 70px;
  background: var(--green);
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #111827;
  color: white;
}

.trust-strip div {
  min-height: 120px;
  border-right: 1px solid rgba(255, 255, 255, 0.12);
  padding: 28px clamp(20px, 4vw, 52px);
}

.trust-strip strong {
  display: block;
  font-size: 30px;
  font-weight: 950;
}

.trust-strip span {
  display: block;
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.68);
  font-size: 14px;
  font-weight: 700;
}

.section,
.showcase,
.cta-section {
  padding: clamp(58px, 7vw, 94px) clamp(20px, 5vw, 72px);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: end;
  gap: 36px;
  margin-bottom: 34px;
}

.section-heading h2,
.showcase h2,
.cta-section h2 {
  font-size: clamp(34px, 4.6vw, 58px);
}

.lead {
  max-width: 1060px;
  margin: 0;
  color: #344054;
  font-size: clamp(20px, 2vw, 28px);
  font-weight: 700;
  line-height: 1.78;
}

.section-summary {
  max-width: 980px;
  margin: -10px 0 30px;
  color: #475467;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.8;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.solution-grid article,
.software-grid article,
.timeline article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  padding: 28px;
  box-shadow: 0 16px 44px rgba(15, 23, 42, 0.06);
}

.solution-grid article span,
.timeline article span {
  color: var(--blue);
  font-size: 14px;
  font-weight: 950;
}

.solution-grid h3,
.software-grid h3,
.timeline h3 {
  margin: 22px 0 0;
  font-size: 24px;
}

.software-grid h3 {
  margin-top: 0;
  font-size: 20px;
}

.solution-grid p,
.software-grid p,
.timeline p,
.showcase p,
.cta-section p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.78;
}

.software-section {
  background: linear-gradient(180deg, #ffffff 0%, #f1f6fb 100%);
}

.software-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.software-grid article {
  min-height: 190px;
}

.software-grid article:nth-child(2),
.software-grid article:nth-child(10) {
  grid-column: span 2;
}

.network-section {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 42px;
  align-items: center;
  padding: clamp(58px, 7vw, 94px) clamp(20px, 5vw, 72px);
  background: #111827;
  color: white;
}

.network-copy h2 {
  margin: 18px 0 0;
  font-size: clamp(34px, 4.6vw, 58px);
  font-weight: 950;
  line-height: 1.08;
}

.network-copy p {
  max-width: 660px;
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.82;
}

.network-section .eyebrow {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.1);
  color: #8bf2ec;
}

.network-grid {
  display: grid;
  gap: 14px;
}

.network-grid article {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  column-gap: 18px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  padding: 22px;
}

.network-grid span {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: rgba(139, 242, 236, 0.12);
  color: #8bf2ec;
  font-weight: 950;
}

.network-grid h3 {
  margin: 0;
  font-size: 22px;
}

.network-grid p {
  grid-column: 2;
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.68);
  font-weight: 700;
  line-height: 1.72;
}

.showcase {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 1.08fr);
  gap: 54px;
  align-items: center;
  background: #eaf1f8;
  scroll-margin-top: 92px;
}

.showcase-copy p {
  max-width: 680px;
  font-size: 18px;
}

.feature-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.feature-list span {
  border: 1px solid rgba(36, 107, 254, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: #1d4ed8;
  font-size: 14px;
  font-weight: 900;
  padding: 10px 13px;
}

.product-board {
  position: relative;
  min-height: 560px;
}

.product-card,
.classroom-screen,
.mobile-control {
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.product-card {
  position: absolute;
  top: 0;
  left: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  width: 360px;
  padding: 18px;
}

.product-card img {
  width: 76px;
  height: 76px;
  border-radius: 8px;
}

.product-card strong,
.product-card span {
  display: block;
}

.product-card strong {
  font-size: 22px;
}

.product-card span {
  margin-top: 6px;
  color: var(--muted);
  font-weight: 700;
}

.classroom-screen {
  position: absolute;
  top: 112px;
  right: 0;
  width: min(100%, 610px);
  min-height: 350px;
  overflow: hidden;
  background: linear-gradient(160deg, #102033, #0d5f5d);
  padding: 24px;
}

.screen-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  color: rgba(255, 255, 255, 0.72);
  font-weight: 800;
}

.screen-header b {
  border-radius: 999px;
  background: rgba(20, 184, 196, 0.2);
  color: #8bf2ec;
  padding: 8px 12px;
}

.student-name {
  display: grid;
  place-items: center;
  min-height: 190px;
  color: white;
  font-size: clamp(58px, 8vw, 106px);
  font-weight: 950;
}

.score-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.score-row span {
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  color: white;
  font-weight: 900;
  padding: 16px;
}

.mobile-control {
  position: absolute;
  left: 0;
  bottom: 0;
  display: grid;
  gap: 12px;
  width: 220px;
  padding: 18px;
}

.mobile-control span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

.mobile-control button {
  min-height: 48px;
  border: 0;
  border-radius: 8px;
  background: #111827;
  color: white;
  font: inherit;
  font-weight: 900;
}

.mobile-control button + button {
  background: var(--blue);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.cta-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.75fr);
  gap: 36px;
  align-items: center;
  background: #111827;
  color: white;
}

.cta-section .eyebrow {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.1);
  color: #8bf2ec;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.68);
  font-size: 18px;
}

.contact-card {
  display: grid;
  gap: 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  padding: 28px;
}

.contact-card strong {
  font-size: 22px;
}

.contact-card span,
.contact-card a {
  color: rgba(255, 255, 255, 0.72);
  font-weight: 700;
  line-height: 1.7;
}

.contact-card a {
  color: #8bf2ec;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: #0b1220;
  color: rgba(255, 255, 255, 0.68);
  padding: 24px clamp(20px, 5vw, 72px);
  font-size: 14px;
  font-weight: 700;
}

@media (max-width: 980px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    width: 100%;
    overflow-x: auto;
  }

  .hero,
  .showcase,
  .cta-section,
  .network-section,
  .section-heading {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-stage,
  .product-board {
    min-height: 520px;
  }

  .trust-strip,
  .solution-grid,
  .software-grid,
  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .software-grid article:nth-child(2),
  .software-grid article:nth-child(10) {
    grid-column: span 1;
  }
}

@media (max-width: 640px) {
  .brand strong {
    white-space: normal;
  }

  .hero-stage {
    min-height: 620px;
  }

  .panel-main,
  .panel-side,
  .product-card,
  .classroom-screen,
  .mobile-control {
    position: relative;
    inset: auto;
    width: 100%;
  }

  .hero-stage,
  .product-board {
    display: grid;
    gap: 14px;
    min-height: auto;
  }

  .hero-orbit {
    display: none;
  }

  .metric-grid,
  .trust-strip,
  .solution-grid,
  .software-grid,
  .timeline,
  .score-row {
    grid-template-columns: 1fr;
  }

  .network-grid article {
    grid-template-columns: 1fr;
  }

  .network-grid p {
    grid-column: auto;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}